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CN1187610C - Biosensor - Google Patents

Biosensor Download PDF

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Publication number
CN1187610C
CN1187610C CNB018007341A CN01800734A CN1187610C CN 1187610 C CN1187610 C CN 1187610C CN B018007341 A CNB018007341 A CN B018007341A CN 01800734 A CN01800734 A CN 01800734A CN 1187610 C CN1187610 C CN 1187610C
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sensor
acid
electrode
reagent layer
biology sensor
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CN1365446A (en
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宫崎正次
德永博之
藤原雅树
中南贵裕
中山润子
山西永吏子
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Pu Hei Holding Co
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Matsushita Electric Industrial Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C12BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12QMEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
    • C12Q1/00Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
    • C12Q1/001Enzyme electrodes
    • C12Q1/002Electrode membranes
    • C12Q1/003Functionalisation

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  • Genetics & Genomics (AREA)
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  • Measuring Or Testing Involving Enzymes Or Micro-Organisms (AREA)

Abstract

In a biosensor for measuring a specific substance in a liquid sample, one or a combination of sugar alcohol, metallic salt, organic acid or organic acid salt which has at least one carboxyl group in a molecule, and organic acid or organic acid salt which has at least one carboxyl group and one amino group in a molecule, is included in a reagent layer provided on electrodes, thereby providing a highly-accurate biosensor which is excellent in stability and has high response (sensitivity, linearity) of the sensor to the substrate concentration.

Description

Biology sensor
Technical field
The present invention relates to analyze the biology sensor of the specific composition in the liquor sample, particularly constitute biology sensor reagent layer reagent constitute.
Background technology
Biology sensor is the molecule distinguishability that utilizes biomaterials such as microorganism, enzyme, antibody, with the sensor of biomaterial as molecular recognition elements.That is, the biomaterial that is immobilized is when the recognition objective predetermined substance, the consumption of the oxygen that utilize the reaction cause, is caused by the breathing of microorganism, enzyme reaction, luminous etc. material.
In biology sensor, the practicability of enzyme sensor is progressive, and the enzyme sensor of using as glucose, lactic acid, cholesterol, lactose, urea, amino acid just is being applied to medical treatment detection or food industry.The electronics that the matrix that contains in the test liquid of enzyme sensor utilization as a corpse or other object for laboratory examination and chemical testing and the reaction of enzyme generate reduces electron acceptor, and determinator utilizes the also commercial weight of this electron acceptor of electrochemical method instrumentation, carries out the quantitative test of a corpse or other object for laboratory examination and chemical testing.As one of this class biology sensor example, known have the spy to be willing to the sensor that proposes in flat 11-324511 number.
Figure 11, the 12nd, the exploded perspective view of the biology sensor that existing blood-sugar level measuring is used.On insulated type substrates such as polyethylene terephthalate 1,101, form the mensuration electrode 2,102 (being also referred to as the effect utmost point) formed by conductive material, to electrode 3,103 (being also referred to as) and detecting electrode 4 to the utmost point, on these electrodes formation contain with test liquid in enzyme, electron transit mediator, the reagent layer 5,105 of hydrophilic macromolecule of special component specific reaction.
For forming the cavity that detects the current value that generates by the reagent reacting in special component in the test liquid and the reagent layer 5,105 with above-mentioned electrode 2,3,4,102,103, be fitted in the cover plate 8,108 that part place on electrode and the reagent layer has the dividing plate 6,106 of elongated cuts portion 7,107 and formed airport 9,109 on the insulated substrate.
In the biology sensor that so constitutes, test liquid utilizes capillarity to supply with in cavity from the inlet (test liquid attracts mouth) of cavity, guides to certain position of electrode and reagent layer.The special component in the test liquid and the reagent reacting of reagent layer generate electric current, and the electric current of generation obtains existing outside determinator by biology sensor and reads, and carries out the quantitative test of a corpse or other object for laboratory examination and chemical testing.
But, in the biology sensor that above-mentioned reagent constitutes, in the presence of heat or moisture, particularly in temperature more than 30 ℃, under the many wet environments of the high temperature of humidity more than 80%, be contained in zymoprotein in the reagent layer 5,105 or part of hydrophilic macromolecule etc. and electron transit mediator generation reduction reaction, so produce background current (noise current), background current value time dependent ground rises, the problem that exists sensor performance significantly to worsen.
As the means that address this problem, preserve in the container at the biology sensor of the container molding that uses alumiseal or resin etc., enclose drying agent such as silica gel or activated alumina, be used for removing moisture, preventing the mis-behave of sensor, is can't remove fully to be included in the biology sensor water of remaining molecular level in the reagent but utilize this class drying agent merely.
Even in above-mentioned preservation container, after the long time, be difficult to also accomplish that moisture invades not at all, the reduction reaction of the part of electron transit mediator and zymoprotein and hydrophilic macromolecule, only in the presence of the moisture of denier, just can carry out, so the extremely difficult time dependent that suppresses background current rises, this is the problem of its existence.
When containing inorganic salts such as the potassium ferricyanide in the mix reagent layer of forming by all ingredients such as enzyme or electron transit mediators, in the dry run of reagent solution, reagent layer is very easy to crystallization, the rough surface of reagent layer, become uneven state, cause responsiveness (rectilinearity, sensitivity) or measure deterioration such as precision with respect to the substrate concentration of sensor.
The present invention is for addressing the above problem, purpose is to provide a kind of and is effectively preventing because of when contacting the performance degradation that causes biology sensor with moisture, with respect to the high high-precision biology sensor of responsiveness (rectilinearity or sensitivity) of the substrate concentration of sensor.
Disclosure of an invention
The biology sensor of first invention of the present invention, it is the biology sensor of measuring the concentration of the predetermined substance in the sample solution, it is characterized in that, for being dissolved in the sample solution and reacting specifically with predetermined substance in the sample solution, and in the reagent layer that sets in advance, contain sugar alcohol, do not hinder enzyme reaction etc., can suppress the rising of background current by the time, also can suppress simultaneously with blood in the unnecessary reactions of the various altogether miscellaneous materials that exist, rectilinearity is good, and (slope of regression equation is big, intercept is little), and the deviation between each sensor is little.
The biology sensor of second invention of the present invention, it is the sensor of above-mentioned the 1st invention, be characterised in that, use be arranged on the insulativity substrate at least by the concentration of the effect utmost point and the above-mentioned predetermined substance of determination of electrode that the utmost point is formed, be a kind of biology sensor of utilizing electrode to check of being suitable for.
The sensor of the 3rd invention of the present invention, it is the sensor of above-mentioned second invention, it is characterized in that, the mentioned reagent layer is formed on the above-mentioned electrode, perhaps the reagent at this reagent layer is dissolved in configured electrodes in the diffusion region that diffuses to form in the test liquid, at least containing enzyme and electron transit mediator in this reagent layer, is the biology sensor that a kind of reaction that is fit to utilize enzyme and electron transit mediator is checked.
The biology sensor of the 4th invention of the present invention, it is the biology sensor of each invention among the above-mentioned 1-3, it is characterized in that, above-mentioned sugar alcohol is the chain polyvalent alcohol, or ring type sugar alcohol, or their replacement body or derivant, be the invention that first sugar alcohol in the invention specialized, can obtain same effect with first invention.
The biology sensor of the 5th invention of the present invention, it is each sensor in the above-mentioned 1-3 item, wherein said sugar alcohol is a kind of in maltitol, the lactitol or two kinds, is the invention that first sugar alcohol in the invention specialized, and can obtain same effect with first invention.
The biology sensor of the 6th invention of the present invention, it is the biology sensor of measuring the concentration of the predetermined substance in the sample solution, it is characterized in that, for being dissolved in the sample solution and reacting specifically with predetermined substance in the sample solution, and in the reagent layer that sets in advance, contain slaine, do not hinder enzyme reaction etc., can suppress the rising of background current by the time.
The biology sensor of the 7th invention of the present invention, it is the sensor of above-mentioned the 6th invention, be characterised in that, use be arranged on the insulativity substrate at least by the concentration of the effect utmost point and the above-mentioned predetermined substance of determination of electrode that the utmost point is formed, be a kind of biology sensor of utilizing electrode to check of being suitable for.
The sensor of the 8th invention of the present invention, it is the sensor of above-mentioned the 7th invention, it is characterized in that, the mentioned reagent layer is formed on the above-mentioned electrode, perhaps the reagent at this reagent layer is dissolved in configured electrodes in the diffusion region that diffuses to form in the test liquid, at least containing enzyme and electron transit mediator in this reagent layer, is the biology sensor that a kind of reaction that is fit to utilize enzyme and electron transit mediator is checked.
The biology sensor of nine inventions of the present invention, it is the biology sensor of each invention among the above-mentioned 6-8, it is characterized in that, above-mentioned slaine is sulfuric acid slaine, hydrogen sulfate slaine, sulfurous acid metal salt, bisulfite slaine, the hydrosulfurous acid slaine, be the invention that the 6th slaine in the invention specialized, can obtain same effect with the 6th invention.
The biology sensor of the of the present invention ten invention, it is each sensor in the above-mentioned 6-8 item, wherein said slaine is a kind of in magnesium sulphate, the calcium sulphate or two kinds, is the invention that the 6th slaine in the invention specialized, and can obtain same effect with the 6th invention.
The biology sensor of the 11 invention of the present invention, it is each sensor in the above-mentioned 6-8 item, wherein said slaine is nitric acid slaine, nitric acid hydrogen slaine, nitrous acid slaine, nitrous acid hydrogen slaine or inferior nitrous acid slaine, be the invention that the 6th slaine in the invention specialized, can obtain same effect with the 6th invention.
The biology sensor of the tenth binomial invention of the present invention, it is each sensor in the above-mentioned 6-8 item, wherein said slaine is a kind of in magnesium nitrate, the calcium nitrate or two kinds, is the invention that the 6th slaine in the invention specialized, and can obtain same effect with the 6th invention.
The biology sensor of the 13 invention of the present invention, it is the biology sensor of measuring the concentration of the predetermined substance in the sample solution, it is characterized in that, for being dissolved in the sample solution and reacting specifically with predetermined substance in the sample solution, and in the reagent layer that sets in advance, contain organic acid or the acylate that at least one carboxyl is arranged in the molecule, do not hinder enzyme reaction etc., can suppress the rising of background current by the time, also can suppress simultaneously with blood in the unnecessary reactions of the various altogether miscellaneous materials that exist, rectilinearity is good, and (slope of regression equation is big, intercept is little), and the deviation between each sensor is little.
The biology sensor of the 14 invention of the present invention, it is the sensor of above-mentioned the 13 invention, be characterised in that, use be arranged on the insulativity substrate at least by the concentration of the effect utmost point and the above-mentioned predetermined substance of determination of electrode that the utmost point is formed, be a kind of biology sensor of utilizing electrode to check of being suitable for.
The sensor of the 15 invention of the present invention, it is the sensor of above-mentioned the 13 invention, it is characterized in that, the mentioned reagent layer is formed on the above-mentioned electrode, perhaps the reagent at this reagent layer is dissolved in configured electrodes in the diffusion region that diffuses to form in the test liquid, at least containing enzyme and electron transit mediator in this reagent layer, is the biology sensor that a kind of reaction that is fit to utilize enzyme and electron transit mediator is checked.
The biology sensor of the 16 invention of the present invention, it is the biology sensor of each invention among the above-mentioned 13-15, it is characterized in that, above-mentioned organic acid is aliphatic carboxylic acid, carbocyclic ring carboxylic acid, heterocyclic carboxylic acid or their replacement body or derivant, be the invention that the 13 organic acid in the invention specialized, can obtain same effect with the 13 invention.
The biology sensor of the 17 invention of the present invention, it is each sensor in the above-mentioned 13-15 item, wherein said organic acid is one or two or more kinds the combination in glutaric acid, hexane diacid, phthalic acid, the benzoic acid, be the invention that the 13 carboxylic acid in the invention specialized, can obtain same effect with the 13 invention.
The biology sensor of the 18 invention of the present invention, it is the biology sensor of measuring the concentration of the predetermined substance in the sample solution, it is characterized in that, for being dissolved in the sample solution and reacting specifically with predetermined substance in the sample solution, and in the reagent layer that sets in advance, contain at least one carboxyl and amino organic acid or acylate are arranged in the molecule, because can be fine and close and form reagent layer in heterogeneity, so raising that can be tremendous is with respect to the responsiveness of substrate concentration (sensitivity, value linear).
The biology sensor of the 19 invention of the present invention, it is the sensor of above-mentioned the 18 invention, be characterised in that, use be arranged on the insulativity substrate at least by the concentration of the effect utmost point and the above-mentioned predetermined substance of determination of electrode that the utmost point is formed, be a kind of biology sensor of utilizing electrode to check of being suitable for.
The sensor of the 20 invention of the present invention, it is the sensor of above-mentioned the 19 invention, it is characterized in that, the mentioned reagent layer is formed on the above-mentioned electrode, perhaps the reagent at this reagent layer is dissolved in configured electrodes in the diffusion region that diffuses to form in the test liquid, at least containing enzyme and electron transit mediator in this reagent layer, is the biology sensor that a kind of reaction that is fit to utilize enzyme and electron transit mediator is checked.
The biology sensor of the 21 invention of the present invention, it is the biology sensor of each invention among the above-mentioned 18-20, it is characterized in that, above-mentioned organic acid is amino acid or its replacement body or derivant, be the invention that the 18 organic acid in the invention specialized, can obtain same effect with the 18 invention.
The biology sensor of the 20 binomial invention of the present invention; it is each sensor in the above-mentioned 18-20 item; wherein said amino acid is one or two or more kinds the combination in glycocoll, serine, proline, threonine, lysine, the taurine; be the invention that the 18 carboxylic acid in the invention specialized, can obtain same effect with the 18 invention.
The biology sensor of the 23 invention of the present invention, it is the biology sensor of measuring the concentration of the predetermined substance in the sample solution, it is characterized in that, for being dissolved in the sample solution and reacting specifically with predetermined substance in the sample solution, and in the reagent layer that sets in advance, contain sugar alcohol, slaine, have in the molecule at least one carboxyl and amino organic acid or the two or more at least combination in the acylate are arranged in the organic acid of at least one carboxyl or acylate or the molecule, good stability, and responsiveness (sensitivity with respect to substrate concentration, value is linear) height is a kind of high-precision sensor.
The biology sensor of 24 inventions of the present invention, it is the sensor of above-mentioned 1-23 item invention, it is characterized in that, in above-mentioned reagent layer, also contain hydrophilic macromolecule, so because contain hydrophilic macromolecule forms homogeneous easily at electrode surface reagent, the effect of the closed state of can be improved electrode and reagent.In addition,, form, can provide the deviation between each sensor few high-performance biology sensor so can realize the reagent of homogeneous because each material becomes the state that homogeneous disperses in reagent layer.
The simple declaration of accompanying drawing
Fig. 1 is illustrated in the sensor response characteristics when adding lactitol as sugar alcohol among the embodiment 1 in sample solution.
Fig. 2 is illustrated in the sensor response characteristics when adding maltitol as sugar alcohol among the embodiment 1 in sample solution.
Fig. 3 is illustrated among the embodiment 1 rising of the background current under the cruel environment of mistake when using Purified Water as sample solution.
Fig. 4 is illustrated among the embodiment 1 rising of the whole blood response value under the cruel environment of mistake when using whole blood as sample solution.
Fig. 5 is illustrated among the embodiment 2 rising of the background current under the cruel environment of mistake when using Purified Water as sample solution.
Fig. 6 is illustrated among the embodiment 2 rising of the whole blood response value under the cruel environment of mistake when using whole blood as sample solution.
Fig. 7 is illustrated among the embodiment 3 rising of the background current under the cruel environment of mistake when using Purified Water as sample solution.
Fig. 8 is illustrated among the embodiment 4 rising of the background current under the cruel environment of mistake when using Purified Water as sample solution.
Fig. 9 is illustrated in the whole blood response value when using whole blood as sample solution among the embodiment 5.
Figure 10 is illustrated in the whole blood response value when using whole blood as sample solution among the embodiment 5.
Figure 11 is one of the exploded perspective view example of the biology sensor of 3 electrode modes.
Figure 12 is one of the exploded perspective view example of the biology sensor of 2 electrode modes.
The preferred plan that carries out an invention
Embodiment 1
The biology sensor of embodiment of the present invention 1 below is described.Should illustrate, in each embodiment of the present invention of following explanation, use enzyme as with sample solution in the molecular recognition elements of predetermined substance specific reaction, be that example describes with this enzyme sensor.
Figure 11 is one of the exploded perspective view example of the biology sensor of 3 electrode modes, and Figure 12 is one of the exploded perspective view example of the biology sensor of 2 electrode modes.Among Figure 11 and Figure 12,1,101 is the insulativity substrate, on this insulativity substrate 1,101 according to the rules position and shape form the mensuration electrode 2,102 that forms by conductive material, to electrode 3,103.In the biology sensor of 3 electrode modes shown in Figure 11, also in accordance with regulations position and shape is formed with and detects electrode 4 on the substrate 1 of insulativity.The said electrode 4 that detects has the function that detects corpse or other object for laboratory examination and chemical testing quantity not sufficient, can be used as contrast electrode or the part of electrode is used.
Material as the above-mentioned insulativity substrate 1,101 that is fit to has polyethylene terephthalate, polycarbonate, polyimide etc.
Constitute the conductive material of each electrode, monomer materials such as noble metals such as gold, platinum, palladium or graphite are for example arranged, or compound substances such as carbon paste or noble metal paste.
Monomer materials such as noble metals such as gold, platinum, palladium or carbon paste, can utilize splash vapour deposition method etc. easily to form conductive layer on insulativity substrate 1,101, compound substances such as carbon paste or noble metal paste can utilize methods such as serigraphy to form conductive layer on insulativity substrate 1,101.
When forming each electrode, utilize above-mentioned splash vapour deposition method or silk screen print method etc. on insulativity substrate 1,101, to form all sidedly, perhaps after forming above-mentioned conductive layer on the part, utilize laser etc. that slit is set, cut apart the formation electrode thus.In addition, use the silk screen print method of the galley be pre-formed electrode pattern or mask or splash vapour deposition method etc., also can form electrode equally.
On the electrode of above-mentioned formation, form the reagent layer 5,105 that contains enzyme, electron transit mediator, hydrophilic macromolecule and sugar alcohol.
Embodiment of the present invention 1 are characterised in that, contain sugar alcohol in reagent layer 5,105.In the reagent layer 5,105 that on electrode, forms, a part of functional group that the reactivity that exists in zymoprotein that contains in the electron transit mediator of this sugar alcohol and oxidized form, the reagent and the hydrophilic macromolecule etc. is abundant etc. contacts, and has the electron transit mediator of inhibition and is changed into the function of reduced form (being reduced) by oxidized form.
Therefore, in the biology sensor that mentioned reagent constitutes, in the presence of heat or moisture, particularly temperature is more than 30 ℃, under the how warm environment of the high temperature of humidity more than 80%, the background current (noise current) that the time dependent that the reduction reaction of the zymoprotein that contains in the reagent layer 5,105 or the part of hydrophilic macromolecule etc. and electron transit mediator causes rises can be suppressed, and can prevent the mis-behave of biology sensor.
By in reagent layer, containing sugar alcohol, can suppress with blood in the various unnecessary reactions of miscellaneous materials altogether that particularly exist in the blood cell, rectilinearity good (slope of regression equation is big, and intercept is little), and the deviation between each sensor is few, and high performance biology sensor can be provided.
As the above-mentioned sugar alcohol that contains in the reagent layer 5,105, the polyvalent alcohol or the ring type sugar alcohol of chains such as D-sorbite, maltitol, xylitol, mannitol, lactitol, reduction パ ラ チ ノ one ス, arabitol, glycerine, ribitol, galactitol, sedoheptose alcohol, mannoheptose, sedoheptulose, styracitole, polygalite, iditol, talitol, Allit, イ シ リ ト one Le, reduction starch saccharification thing for example arranged.
The steric isomer of these sugar alcohols, replacement body or derivant also can obtain same effect.
In these sugar alcohols, maltitol and lactitol can be described as and suppress above-mentioned background electric current effect best material because the bill of materials price ratio more cheaply and easily obtains.
The addition of these sugar alcohols is 0.1-500mM as sample solution concentration, preferred 1-100mM.
Biology sensor shown in Figure 11 and 12, afterwards, fitting on the reagent layer 5,105 that so forms, electrode 2,3,4,102,103 has the dividing plate 6,106 and the cover plate 8,108 of notch 7,107, forms the cavity of supplying with test liquid.
The suitable material of aforementioned barriers 6,106 and cover plate 8,108 for example has polyethylene terephthalate, polycarbonate, polyimide, polybutylene terephthalate, polyamide, Polyvinylchloride, Vingon, nylon etc.
Utilize capillarity to realize supplying with sample solution,, also be necessary to have airport 9,109 in the cavity, so that air is discharged to the outside of biology sensor except realizing supplying with reposefully the sample solution to the biology sensor that constitutes by above-mentioned cavity.
The configuration of airport 9,109 as long as in the scope that does not hinder test liquid to supply with, can be positioned at any position of cavity.
In the biology sensor of above-mentioned formation, the current value that special component in the test liquid and reagent layer 5,105 reactions that contain enzyme etc. obtain, by measure electrode 2,102, to electrode 3,103, detect the wire portion separately 10,11,12,110,111 of electrode 4, read by the determinator of the outside that connects.
Embodiment 2
The biology sensor of embodiment of the present invention 2 below is described.
The biology sensor of embodiment of the present invention 2, shown in Figure 11 and 12, reagent layer 5,105 is formed by enzyme, electron transit mediator, hydrophilic macromolecule and slaine.Other inscape is identical with aforesaid embodiment 1, so omit explanation.
Embodiment of the present invention 2, be characterised in that in reagent layer 5,105 and contain slaine, this slaine can be suppressed in the reagent layer 5,105 that forms on the electrode, the zymoprotein that contains in oxidized form electron transit mediator and the reagent and be present in that the abundant a part of functional group of reactivity in the hydrophilic macromolecule etc. contacts and the electron transit mediator that causes by the modification (be reduced) of oxidized form to reduced form.
Therefore in the biology sensor that mentioned reagent constitutes, in the presence of heat or moisture, particularly temperature is more than 30 ℃, under the many wet environments of the high temperature of humidity more than 80%, the background current (noise current) that the time dependent that the reduction reaction of the zymoprotein that contains in the reagent layer 5,105 or the part of hydrophilic macromolecule etc. and electron transit mediator causes rises can be suppressed, and can prevent the mis-behave of biology sensor.
As reagent layer 5, the slaine that contains in 105, sulfuric acid slaine or nitric acid slaine etc. are effective especially, the sulfuric acid slaine is for example arranged, the hydrogen sulfate slaine, sulfurous acid metal salt, the bisulfite slaine, or hydrosulfurous acid slaine, be specially aluminium sulphate, magnesium sulphate, zinc sulfate, antimony sulfate, indium sulfate, uranyl sulfate, uranous sulfate, cadmium sulfate, glazier's salt, gallium sulfate, calcium sulphate, silver sulfate, chromium sulfate, cobaltous sulphate, potassium acid sulfate, zirconium sulfate, mercuric sulfate, STANNOUS SULPHATE CRYSTALLINE, strontium sulfate, cesium sulfate, cerous sulfate, thallium sulfate, titanium sulfate, iron sulfate, copper sulphate, sodium sulphate, lead sulfate, nickelous sulfate, Dineodymium trisulfate, vanadic sulfate, palladium sulfate, barium sulphate, bismuth sulfate, praseodymium sulfate, beryllium sulfate, manganese sulfate, lanthanum sulfate, lithium sulfate, rubidium sulfate, aluminium potassium sulfate, aluminum sodium sulfate, uranyl potassium sulfate, chromium potassium suplhate, the sulfuric acid disodium magnesium, the magnesium sulphate dipotassium, the manganese sulfate caesium, rubidium sulfate aluminium, potassium acid sulfate, niter cake, potassium sulfite, calcium sulfite, sodium sulphite, barium sulfite, the sulphurous acid bismuth, sodium hydrosulfite, potassium bisulfite, sodium bisulfite etc., as the nitric acid slaine, nitric acid hydrogen slaine, nitrous acid hydrogen slaine or inferior nitrous acid slaine have aluminium nitrate, magnesium nitrate, zinc nitrate, nitric acid antimony, ytterbium nitrate, yttrium nitrate, indium nitrate, uranyl nitrate, erbium nitrate, cadmium nitrate, gadolinium nitrate, potassium nitrate, calcium nitrate, silver nitrate, chromic nitrate, cobalt nitrate, samaric nitrate, zirconium nitrate, dysprosium nitrate, mercuric nitrate, nitric acid tin, strontium nitrate, cesium nitrate, cerous nitrate, thallium nitrate, ferric nitrate, terbium nitrate, copper nitrate, thorium nitrate, sodium nitrate, plumbi nitras, nickel nitrate, neodymium nitrate, palladium nitrate, barium nitrate, bismuth nitrate, praseodymium nitrate, beryllium nitrate, holmium nitrate, manganese nitrate, europium nitrate, lanthanum nitrate, lithium nitrate, the nitric acid ruthenium, rubidium nitrate, rhodium nitrate, thallium nitrate mercury, potassium nitrite, silver nitrite, calcium nitrite, sodium nitrite, cobalt potassium nitrite, natrium cobaltinitrosum, inferior sodium nitrite etc.
In these slaines, particularly the moisture absorption of magnesium sulphate, calcium sulphate, magnesium nitrate, calcium nitrate prevents the effect height, so preferred.
The addition of slaine is 0.1-500mM, more preferably 1-50mM as reagent solution concentration.
Embodiment 3
The biology sensor of embodiment of the present invention 3 below is described.
The biology sensor of embodiment of the present invention 3, shown in Figure 11 and 12, reagent layer 5,105 is by having the organic acid of at least one carboxyl or acylate to form in enzyme, electron transit mediator, hydrophilic macromolecule and the molecule.Other inscape is identical with aforesaid embodiment 1, so omit explanation.
Embodiment of the present invention 3, be characterised in that and in reagent layer 5,105, contain organic acid or the acylate that at least one carboxyl is arranged in the molecule, have the organic acid of at least one carboxyl or acylate can be suppressed at the zymoprotein that contains in the oxidized form electron transit mediator and reagent in the reagent layer 5,105 that forms on the electrode in this molecule and be present in that the abundant a part of functional group of reactivity in the hydrophilic macromolecule etc. contacts and the electron transit mediator that causes by the modification (be reduced) of oxidized form to reduced form.
Therefore in the biology sensor that mentioned reagent constitutes, in the presence of heat or moisture, particularly temperature is more than 30 ℃, under the many wet environments of the high temperature of humidity more than 80%, the background current (noise current) that the time dependent that the reduction reaction of the zymoprotein that contains in the reagent layer 5,105 or the part of hydrophilic macromolecule etc. and electron transit mediator causes rises can be suppressed, and can prevent the mis-behave of biology sensor.
By in reagent layer, containing organic acid or the acylate that at least one carboxyl is arranged in the molecule, can suppress with blood in the various unnecessary reactions of miscellaneous materials altogether that particularly exist in the blood cell, rectilinearity is good, and (slope of regression equation is big, intercept is little), and the deviation between each sensor is few, and high performance biology sensor can be provided.
Organic acid or acylate as at least one carboxyl is arranged in the molecule that contains in the reagent layer 5,105 have aliphatic carboxylic acid, carbocyclic ring carboxylic acid, heterocyclic carboxylic acid etc., and salt.
For example, as aliphatic carboxylic acid, malonic acid, succinic acid, glutaric acid, hexane diacid, maleic acid, fumaric acid etc. and salt thereof are arranged.
Straight chain is long more, molecular weight is big more, and effect is good more, preferably has the material of 3 above hydrocarbon chains especially.The reagent requirement that is used for biology sensor wants high to the dissolubility of water, so preferably have a plurality of hydrophilic functional groups in the molecular configuration.
As the carbocyclic ring carboxylic acid, benzoic acid, phthalic acid, m-phthalic acid, terephthalic acid (TPA) etc. or its salt are arranged, use these materials also can obtain the effect identical with above-mentioned substance.
As heterocyclic carboxylic acid, the acid of 2-Off Le, nicotinic acid, isonicotinic acid etc. or its salt are for example arranged, use these materials also can obtain the effect identical with above-mentioned substance.
Above-mentioned aliphatics and carbocyclic ring carboxylic acid, have beyond the carboxylic acid or carboxylate of heterocycle, a part of functional group of carboxylic acid and carboxylate also can be obtained the effect identical with above-mentioned substance by what other functional group replaced as malic acid, ethane diacid one ethyl acetoacetic acid, citric acid, ketoglutaric acid etc. or its salt.
Optimal material is glutaric acid, hexane diacid, phthalic acid, benzoic acid in these organic acids or the acylate.
The addition of these organic acids or acylate is as reagent solution concentration, in the 0.01-100mM scope, preferably in the 0.1-10mM scope.
Embodiment 4
The biology sensor of embodiment of the present invention 4 below is described.
The biology sensor of embodiment of the present invention 4, shown in Figure 11 and 12, reagent layer 5,105 is by having at least one carboxyl and amino organic acid or acylate to form in enzyme, electron transit mediator, hydrophilic macromolecule and the molecule.Other inscape is identical with aforesaid embodiment 1, so omit explanation.
Embodiment of the present invention 4, be characterised in that in reagent layer 5,105, to contain at least one carboxyl and amino organic acid or acylate are arranged in the molecule, by in reagent layer 5,105, adding this organic acid or acylate, can make the surface state of reagent layer 5,105 very level and smooth, and can form in heterogeneity.When particularly in reagent layer 5,105, containing the inorganic salts such as the potassium ferricyanide that use as electron transit mediator, the easy crystallization of reagent layer in the dry run in the reagent solution, but by in reagent, containing at least one carboxyl and amino organic acid or acylate are arranged in the molecule, can suppress the crystallization of these inorganic salts.
The repressed inorganic salts of crystallization exist in reagent layer with small particle state, thus can with the enzyme molecule closely, contact equably, realize the good reagent layer state of electron transport efficient with the enzyme molecule.
Because can improve the dissolubility of reagent layer, so the sensitivity of sensor and rectilinearity can improve tremendously.
As at least one carboxyl and amino organic acid or acylate are arranged in the molecule that contains in the reagent layer 5,105; glycocoll, alanine, valine, leucine, isoleucine, serine, threonine, methionine, aspartic acid, glutamic acid, arginine, lysine, histidine, phenylalanine, tryptophane, proline etc. or its salt are for example arranged, or organic acid or acylate such as methyl amimoacetic acid, betaine, taurine.
The replacement body or the derivant of these organic acids or acylate also can obtain same effect.
In these organic acids or acylate, glycocoll, serine, proline, methionine, lysine, taurine have the effect of extra high inhibition crystallization, so preferred.
The addition of these organic acids or acylate is in the 0.1-1000mM scope as reagent solution concentration, preferably in the 10-500mM scope.
Embodiment of the present invention 1-4, for example understanding respectively has at least one carboxyl and the amino organic acid or the example of acylate in organic acid that at least one carboxyl is arranged or acylate, the molecule in mentioned reagent layer 5,105 adds sugar alcohols, slaine, molecule, these schemes also can applied in any combination.
The enzyme that contains in the reagent of above-mentioned embodiment 1-4, glucose oxidase, lactate oxidase, cholesterol oxidase, cholesterol esterase, uricase, ascorbic acid oxidase, bilirubin oxidase, glucose dehydrogenase, lactate dehydrogenasa etc. are for example arranged, as electron transit mediator, the potassium ferricyanide, 1,4-benzoquinone and its derivant, phenazine methosulfate, methyl blue, ferrocene and its derivant etc. are arranged.
Among embodiment of the present invention 1-4, be illustrated for the hydrophilic macromolecule that contains in the reagent layer 5,105, by in reagent layer 5,105, containing hydrophilic macromolecule, can make reagent solution have viscosity, on electrode, form reagent easily in heterogeneity, can improve the adaptation between electrode and the reagent simultaneously.By containing hydrophilic macromolecule, the dried reagent crystalline state of reagent homogeneous can also be made in addition, high-precision biology sensor can be prepared.
The hydrophilic macromolecule that is used for above purpose for example has polyaminoacid and its salt, polystyrolsulfon acid, gelatin and its derivant, acrylic acid and its salt, methacrylic acid and its salt, starch and its derivant, maleic anhydride and its salt, Ago-Gel and its derivants etc. such as carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, methylcellulose, ethyl cellulose, ethylhydroxyethylcellulose, carboxymethylethylcellulose, polyvinyl alcohol, polyvinylpyrrolidone, polylysine.
Among embodiment of the present invention 1-4, illustrated that above-mentioned reagent layer is arranged on the electrode, particularly, configuration reagent layer 5,105 on the integral body of electrode or a part, in addition, in the scope of the mis-behave that does not make biology sensor, promptly, reagent in the reagent layer is dissolved in the diffusion region of spreading in the test liquid electrode is set, configuration reagent layer 5,105.
Embodiment 1
On the insulated substrate of making by polyethylene terephthalate, utilize the splash evaporation to form the thick palladium membranes of about 10nm on the whole on the surface of insulated substrate, utilize YAG laser on the part of above-mentioned film, to form slit afterwards, with dividing electrodes form to measure electrode, to electrode with detect electrode.Drip the aqueous solution that contains enzyme (glucose oxidase), electron transit mediator (potassium ferricyanide), hydrophilic macromolecule (carboxymethyl cellulose) and sugar alcohol with circle thereon, to measure electrode is the center, covering is to an electrode and a part that detects electrode, and drying forms reagent layer.The dividing plate with otch and the same cover plate that forms by polyethylene terephthalate of fitting thereon again and forming by polyethylene terephthalate with airport, formation becomes the cavity capillaceous that imports blood, makes the blood-sugar level measuring sensor of 3 electrode modes.
Sensor response characteristics when Fig. 1 is illustrated in the reagent solution and adds lactitol as sugar alcohol, test liquid is a whole blood, changes the concentration of lactitol, totally 4 kinds.When Fig. 2 represents the same maltitol that adds as sugar alcohol, change the response characteristics of sensor of the concentration of 4 kinds of maltitols.Wherein the interpolation concentration of sugar alcohol (as the concentration of reagent water solution) is to handle as existing sensors in 0 o'clock, is 5,10,25, is sensor of the present invention during 50mM.
Fig. 3 represents to use the above-mentioned sensor determination of making to change at the time dependent of crossing the background current of (30 ℃ of temperature, humidity exposes for 80% time) under the cruel environment.Use the Purified Water that does not contain glucose as test liquid.The variation of the by the time sensor response value of the whole blood that Fig. 4 represents to use concentration of glucose to be adjusted into 80mg/dL during as sample solution.In either case, mensuration all is respectively (0 hour) after the sensor production period, made back 6 hours, 12 hours, 24 hours, totally 4 points.
The amperometric determination condition is, confirms behind the filling sample solution, to promote enzyme reaction 25 seconds in cavity, measuring electrode and to electrode and detect the voltage that applies 0.2V between electrode, measuring the current value that obtains after 5 seconds afterwards.Detecting electrode herein, also uses as the part to electrode.
Measure frequency n and be n=10 period, map with its mean value among the figure in each concentration and mensuration.
As shown in Figure 1, interpolation is compared with not sugar alcohol contained existing sensor as the sensor response characteristics of the lactitol of sugar alcohol, is that high concentration region more than the 400mg/dL shows high response value tendency at concentration of glucose especially, can obtain the response characteristics of regression equation good (intercept is little, and slope is big).
As shown in Figure 2, identical when using maltitol with the situation of above-mentioned use lactitol as sugar alcohol, also can obtain good response characteristics.
By Fig. 3 and Fig. 4 as can be known, in the sensor that adds sugar alcohol, can effectively suppress the increase of the background current under the high humidity high temperature exposure environment, the response value that can obtain sensor through the time good storage stability with low uncertainty.
Embodiment 2
Prepare the blood-sugar level measuring sensor similarly to Example 1.But wherein replace sugar alcohol as suppressing the adjuvant that the background current time dependent rises with the sulfuric acid slaine, this sulfuric acid slaine is a magnesium sulphate.
Fig. 5 represents to use the above-mentioned sensor determination of making to change at the time dependent of crossing the background current of (30 ℃ of temperature, humidity exposes for 80% time) under the cruel environment.Use the Purified Water that does not contain glucose as test liquid.The variation of the by the time sensor response value of the whole blood that Fig. 6 represents to use concentration of glucose to be adjusted into 80mg/dL during as sample solution.
In either case, mensuration all is respectively (0 hour) after the sensor production period, made back 6 hours, 12 hours, 24 hours, totally 4 points.
Amperometric determination condition and mensuration number of times are with embodiment 1.
By Fig. 5 and Fig. 6 as can be known, the sugar alcohol that adds the sensor of sulfuric acid slaine and embodiment 1 is same, can effectively suppress the increase of the background current under the high humidity high temperature exposure environment, the response value that can realize sensor through the time good storage stability with low uncertainty.
Embodiment 3
On the insulated substrate of making by polyethylene terephthalate, utilize the serigraphy setting by the electrode layer that acts on the utmost point and the utmost point is formed, form thereon and contain enzyme (glucose oxidase), electron transit mediator (potassium ferricyanide), the reagent layer of hydrophilic macromolecule (carboxymethyl cellulose) and aliphatic carboxylic acid (concentration as reagent solution is 5mM), the dividing plate and the same cover plate that forms by polyethylene terephthalate of fitting afterwards and forming by polyethylene terephthalate, form as the cavity capillaceous that imports blood, make the blood-sugar level measuring sensor of 2 electrode modes.
Preparation is used aliphatic carboxylic acid malonic acid, glutaric acid, hexane diacid three kinds respectively as organic acid, and the existing sensor of not fatty family carboxylic acid, amounts to the sensor of 4 kind of 2 electrode mode.
Fig. 7 represents to use above-mentioned 4 kinds of sensor determinations making at the background current of crossing (40 ℃ of temperature, humidity exposes for 80% time) under the cruel environment, uses the Purified Water that does not contain glucose as test liquid.Mensuration all is respectively (0 day) after the sensor production period, made back 7 days, 14 days, 30 days, totally 4 points.The amperometric determination condition is, after sample solution (Purified Water) is filled in the cavity, promotes reaction 25 seconds, applies the voltage of 0.5V at the effect utmost point with to interpolar afterwards, measures the current value after 5 seconds.
Measuring number of times is n=10 all at each measuring point, maps with its mean value among Fig. 7.
As shown in Figure 7, the sensor that adds aliphatic carboxylic acid can suppress the rising of background current really, its escalating rate reduces according to the order of malonic acid, glutaric acid, hexane diacid, shows that molecular configuration is complicated more, straight chain is long more, molecular weight is big more, and the effect that suppresses the background current rising is big more.The current value that herein obtains is equivalent to the potassium ferricyanide amount that the reaction of the glucose oxidase and the potassium ferricyanide and carboxymethyl cellulose and the potassium ferricyanide generates.
Embodiment 4
Prepare biology sensor similarly to Example 3, estimate similarly to Example 3.Wherein use 3 kinds of the malic acid (butanedioic acid derivative) that the part of the hydrocarbon chain of carbocyclic ring carboxylic acid benzoic acid, phthalic acid and succinic acid replaced by hydroxyl as organic acid.
As shown in Figure 8, use any in benzoic acid, phthalic acid, the malic acid, can suppress the rising of background current similarly to Example 3.
Embodiment 5
On the insulated substrate of making by polyethylene terephthalate, utilize the serigraphy setting by the electrode layer that acts on the utmost point and the utmost point is formed, form thereon and contain enzyme (with the glucose dehydrogenase of pyrroloquinoline benzoquinones) as coenzyme, electron transit mediator (potassium ferricyanide), hydrophilic macromolecule (carboxymethyl cellulose) and aliphatic carboxylic acid (phthalic acid), amino acid whose reagent layer, the dividing plate and the same cover plate that forms by polyethylene terephthalate of fitting afterwards and forming by polyethylene terephthalate, form as the cavity capillaceous that imports blood, make the blood-sugar level measuring sensor of 2 electrode modes.
Preparation is used respectively in the molecule by at least one carboxyl and amino amino acid---glycocoll (Gly), serine (Ser), proline (Pro), threonine (Thr), lysine (Lys), methyl amimoacetic acid (derivant of glycocoll), taurine as organic acid; and do not contain amino acid whose existing sensor, amount to 8 kinds of sensors.
Use the sensor response characteristics when representing to use glucose in above-mentioned 8 kinds of sensor determination people whole bloods making as Fig. 9 and Figure 10.Concentration of glucose in the whole blood is respectively 40,80,350,600,700mg/dl.
The amperometric determination condition is, after sample solution (people's whole blood) is filled in the cavity, promotes reaction 25 seconds, applies the voltage of 0.5V at the effect utmost point with to interpolar afterwards, measures the current value that obtains after 5 seconds.
Measuring number of times is n=20 all at each measuring point, maps with its mean value among the figure.
By Fig. 9,10 as can be known, though because of the different response values of amino acid whose kind have some differences, but compare with not containing amino acid whose existing sensor, particularly the concentration of glucose is the above high concentration region of 480mg/dl, can confirm tremendous response value and linear raising.
Table 1 is the result that the deviation of the said n=20 sensor response value when measuring compares with the CV value.As shown in Table 1, add in the amino acid whose sensor of the present invention, can confirm the significantly optimization of CV value.This be because, in reagent layer, added the crystallization that amino acid has prevented the potassium ferricyanide, smoothly and in heterogeneity formed reagent layer, make the dissolubility of reagent and the diffusion homogeneous that becomes, alleviated and replied deviation.
Table 1
Concentration 40 80 350 600 700
Existing sensor 3.25% 2.48% 2.05% 2.11% 4.15%
Gly-133mM 2.15% 1.75% 1.55% 1.28% 1.05%
Ser-95mM 2.54% 2.11% 1.75% 1.45% 1.22%
Pro-87mM 2.38% 1.98% 1.69% 1.40% 1.18%
Thr-84mM 2.18% 2.00% 1.65% 1.39% 1.24%
Lys-HCl-55mM 2.48% 1.89% 1.58% 1.41% 1.14%
Methyl amimoacetic acid-122mM 2.65% 2.08% 1.68% 1.35% 1.25%
Taurine 2.18% 1.78% 1.43% 1.22% 1.10%
The foregoing description 1-5 has shown the biology sensor of measuring the concentration of glucose in the blood, form as sample solution, material and the biology sensor of determination object is not limited to these, for example, as the object sample solution can also be organism sample liquid such as saliva, interstitial cell fluid, urine or sweat except that blood, also can be Foods or drinks water etc.As the object material, except that glucose, can also use lactic acid, cholesterol, uric acid, ascorbic acid, cholerythrin etc.As galvanometric system, can be use in embodiment 1 and 2 by measure electrode, to electrode with detect the 3 electrode modes that electrode is formed, or use among the embodiment 3-5 only by measure electrode, to the 2 electrode modes that electrode is formed, any mode can obtain same result.Above-mentioned 3 electrode modes can be measured more accurately than 2 electrode modes.
Be that example has illustrated biology sensor in the present embodiment with the enzyme sensor, but the present invention is applicable to the material that utilizes beyond the enzyme too---as antibody, microorganism, DNA, RNA etc. as with test liquid in the biology sensor of molecular recognition elements of predetermined substance specific reaction.
Applicability on the industry
Biology sensor of the present invention, by in reagent layer, containing the combination that at least one carboxyl and amino organic acid or any one or they in the acylate are arranged in organic acid that at least one carboxyl is arranged in sugar alcohol, slaine, the molecule or acylate or the molecule, can not hinder thus enzyme reaction ground and suppress the by the time rising of background current, the various altogether unnecessary reactions between the miscellaneous material that exist in inhibition and the blood, can be fine and close and form in heterogeneity reagent layer, good stability and high performance biology sensor can be provided.

Claims (2)

1. biology sensor, its have the insulativity substrate, be provided with on the aforesaid substrate at least by the effect utmost point and electrode that the utmost point is formed and the reagent layer that contains enzyme and sugar alcohol at least that on above-mentioned electrode, forms, it is characterized in that said sugar alcohol is a kind of in maltitol, the lactitol or two kinds.
2. the biology sensor of claim 1 is characterized in that, contains electron transit mediator in this reagent layer.
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US8673127B2 (en) 2014-03-18
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US7648617B2 (en) 2010-01-19
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